gistfile1.txt

$ perl -MCarp::Always -MMoose -E 'package R; use Moose::Role; package C; use Moose; has attr => (is => "ro", traits => [R => { foo => 1 }])'

Roles with parameters cannot be cached. Consider applying the parameters before calling create_anon_class, or using 'weaken => 0' instead at /Users/sartak/.perl/perls/perl-5.14.1/lib/site_perl/5.14.1/darwin-2level/Moose/Meta/Class.pm line 145
        Moose::Meta::Class::_anon_cache_key('Moose::Meta::Class', 'roles', 'ARRAY(0x100b75ca8)', 'weaken', '', 'superclasses', 'ARRAY(0x100b78210)') called at /Users/sartak/.perl/perls/perl-5.14.1/lib/site_perl/5.14.1/darwin-2level/Class/MOP/Package.pm line 109
        Class::MOP::Package::create_anon('Moose::Meta::Class', 'superclasses', 'ARRAY(0x100b78210)', 'roles', 'ARRAY(0x100b75ca8)', 'cache', 1) called at /Users/sartak/.perl/perls/perl-5.14.1/lib/site_perl/5.14.1/darwin-2level/Class/MOP/Class.pm line 473
        Class::MOP::Class::create_anon_class('Moose::Meta::Class', 'superclasses', 'ARRAY(0x100b78210)', 'roles', 'ARRAY(0x100b75ca8)', 'cache', 1) called at /Users/sartak/.perl/perls/perl-5.14.1/lib/site_perl/5.14.1/darwin-2level/Moose/Meta/Attribute.pm line 155
        Moose::Meta::Attribute::interpolate_class('Moose::Meta::Attribute', 'HASH(0x100a85ed8)') called at /Users/sartak/.perl/perls/perl-5.14.1/lib/site_perl/5.14.1/darwin-2level/Moose/Meta/Attribute.pm line 112
        Moose::Meta::Attribute::interpolate_class_and_new('Moose::Meta::Attribute', 'attr', 'definition_context', 'HASH(0x100985db8)', 'is', 'ro', 'traits', 'ARRAY(0x100827360)') called at /Users/sartak/.perl/perls/perl-5.14.1/lib/site_perl/5.14.1/darwin-2level/Moose/Meta/Class.pm line 704
        Moose::Meta::Class::_process_new_attribute('Moose::Meta::Class=HASH(0x100b6d720)', 'attr', 'definition_context', 'HASH(0x100985db8)', 'is', 'ro', 'traits', 'ARRAY(0x100827360)') called at /Users/sartak/.perl/perls/perl-5.14.1/lib/site_perl/5.14.1/darwin-2level/Moose/Meta/Class.pm line 697
        Moose::Meta::Class::_process_attribute('Moose::Meta::Class=HASH(0x100b6d720)', 'attr', 'definition_context', 'HASH(0x100985db8)', 'is', 'ro', 'traits', 'ARRAY(0x100827360)') called at /Users/sartak/.perl/perls/perl-5.14.1/lib/site_perl/5.14.1/darwin-2level/Moose/Meta/Class.pm line 566
        Moose::Meta::Class::add_attribute('Moose::Meta::Class=HASH(0x100b6d720)', 'attr', 'definition_context', 'HASH(0x100985db8)', 'is', 'ro', 'traits', 'ARRAY(0x100827360)') called at /Users/sartak/.perl/perls/perl-5.14.1/lib/site_perl/5.14.1/darwin-2level/Moose.pm line 77
        Moose::has('Moose::Meta::Class=HASH(0x100b6d720)', 'attr', 'is', 'ro', 'traits', 'ARRAY(0x100827360)') called at /Users/sartak/.perl/perls/perl-5.14.1/lib/site_perl/5.14.1/darwin-2level/Moose/Exporter.pm line 356
        Moose::has('attr', 'is', 'ro', 'traits', 'ARRAY(0x100827360)') called at -e line 1